Simultaneous
Simultaneous adjective - Existing or occurring at the same period of time.
Upon and simultaneous are semantically related In some cases you can replace term "Upon" with "Simultaneous", this adjectives are similar.
Nearby Words: simultaneously, simultaneity
Upon
Upon preposition - In or into contact with.
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Synonyms for Upon
Simultaneous and upon are semantically related in at the time of topic. You can use "Simultaneous" instead a preposition "Upon".
Mutual synonyms
Both words in one sentence
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Then she and Keigo both have epic, simultaneous nosebleeds upon first entering Boobies.
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Upon his HeelFace Turn, he shaves it off, whilst his brother Ruthven grows a twirly mustache and does a simultaneous FaceHeel Turn, also donning a monocle and top hat.
Source: Good Hair, Evil Hair -
Corey and Sally do it simultaneously upon the equally simultaneous realizations (a) by Luke that Vader is his father and (b) by Yoda that Anakin is still alive.
Source: Webcomic / Darths & Droids
Cite this Source
Upon and Simultaneous. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/simultaneous/upon
Simultaneous & Upon. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/simultaneous/upon>.
Upon or Simultaneous. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/simultaneous/upon.
Google Ngram Viewer shows how "simultaneous" and "upon" have occurred on timeline